Object-Oriented

What is Object-Oriented? #

• Everything we use in real life is called an object, and object-oriented programming involves identifying the objects needed for program implementation, defining the role of each object, and creating programs through the interaction of these objects.

  Components of Object-Oriented Programming Languages #

  1. Class

  Defines the attributes and behaviors belonging to the same group.

  2. Object

  An instance of a class that holds its own unique data and can perform the behaviors defined in the class.

  3. Method

  A way to use an object created from a class.

  4. Attribute

  Data values held by objects within a class, defined unit by unit.

What is Overloading? #

• Using the same function name but with different parameters or data types.

ex )

class ExJava {
  int value = 0;
  int exov(int a){
    value = a;
  }
  int exov(int a , int b){
    value = a + b;
  }
  int exov(int a , int b , int c){
    value = a + b * c;
  }
}

What is Method Overriding? #

• Redefining a method inherited from a superclass (or parent class).

Access Specifiers #

1. public: An access specifier that allows all access.
2. protected: An access specifier that allows access from its own class and inherited child classes.
3. private: An access specifier that allows access only from methods within its own class.
4. default: An access specifier that allows access from all classes within the same package, but not from other packages.

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